Synergistic Effect of Hierarchical Nanopores in Co-doped Cobalt Oxide 3D Flowers for Electrochemical Energy Storage

Overview

Journal RSC Adv

Publisher Royal Society of Chemistry

Specialty Chemistry

Date 2022 May 6

PMID 35519709

Authors

Xia Deng

Hong Zhang

Junwei Zhang

Dongsheng Lei

Yong Peng

Affiliations

Soon will be listed here.

Abstract

Hybridizing hierarchical porous transition oxides composed of nanoscale building blocks is highly desirable for improving the electrochemical performance of energy storage. Herein, we contribute a fabrication of novel hierarchically nanoporous flower-shaped metal/transition oxide (Co/CoO-CoO) with controllable three-dimensional structure. The designed Co/CoO-CoO 3D flowers (3DFs) are made of petal-shaped nanoporous CoO-CoO nanosheets with tunable pore sizes, in which metallic Co nanoparticles tend to attach to the edge of larger ones. The hierarchically nanoporous 3DFs with bimodal pore size distribution and higher fraction of small nanopores exhibit a higher specific capacitance (902.3 F g at current density of 2 A g) and better cyclability than the uniformly nanoporous 3DFs with unimodal pore size distribution and larger BET surface area. The enhanced capacitance is mainly derived from the synergistic effect of hierarchical nanopores, in which large nanopores disproportionately facilitate osmotic solution flux and diffusive solute transport, whilst small nanopores supply faster channels for electron transportation and ion diffusion. Our work should provide a strategy to fabricate a smart functional hierarchical nanoporous architecture with 3DF structures for the development of electrochemical energy storage materials.

Citing Articles

Structure and Morphological Properties of Cobalt-Oxide-Based (CoO) Materials as Electrodes for Supercapacitors: A Brief Review.

Garcia M, Arzuza L, Neves G, Loureiro F, Morales M, Macedo D Materials (Basel). 2025; 18(2).

PMID: 39859884 PMC: 11766530. DOI: 10.3390/ma18020413.

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